Grinding-machine



l. 0. RGLLINS GRINDiNG MACHINE. Anrvucmon msn auw 1,3. 1920.

Patented June 14, 1921 .Nmw

[17 Ven 0 n 754W 0 PML/'M6 Grinding UNITI-:D STATES JOHN RLLINS; 0FFRESNO, CALIFQRNIA.

@BINDING-MACHINE.

Specification of Letters Patent. .Patented J une 14, 1921.

Application led Hay 13, 1920. Serial 11o. 381,054.

Toall whom 'it may concern:

Be it known that I, JOHN O. Romans, a citizen o f Switzerland, residingat B'erkeley Hotel, in the city of Fresno, county of Fresno, and Stateof California, have mvented new and useful Improvements in -Machines, ofwhich'the following is a specification.

The present invention relates to a grinding machine and has referencemore particularl to a machine for grindin the beveled surgace on thedisk shaped hea s of puppet valves used on internal combustion engines.

The primary object of the invention is to provide a self contained, soto speak, valve grinding outfit which will enable an one regardless oftheir mechanical skil or the machine shop equipment available to effectthe proper grinding or cleaning of valves or the like.

The preferred embodiment of the inven- )ion is illustrated in theaccompan ing draw- /ing and will be referred to as an illustrativeexample scription:

- In said drawing: Figure 1 is a plan view of the machine showingcoperative relationship of the parts, and with the valve carried therebyin the act of being ground.

Fig. 2 is a side elevation of the machine.

Referring now to the drawings in detail, the idea in its present formcontemplates practically a one piece supporting base on which theoperative parts of the machine in the following detailed deare`installed. This base primarily consistsY in a mounting 1 for the motor2, the same being directly supported by a sub-base 3 which in turn ismounted in the block 4 which block is mounted upon the base 1. Thesub-base 3 preferably comprises a cross slide having beveled marginaledges and received by the cross slot that the motor is capable of alateral sliding adjustment. To effect a fixed position of the motor 2 onthe 'block 4, suitable set screws 6 nre-presented throu h the end of theblock with their ends ma e to engage a side of the sub-base 3. The block4 is adaptedtohave a sliding movement on the base 1 longitudinally ofthe axis of the motor. To realize this adjustment the block 1 isprovided with tracks or the like 7 spaced apart and made to be receivedin suitable elongated slots arranged longitudinally in the block 4.

5 in the block 4 so,

A A screw 8 having a bearing 9 fixed to the end of the base 1 and havinga threaded engage;-

ment with an opening made to receive it in the block 4 is adapted to bemanipulated by the handle 1Q to which it is attached for running theblock 4 longitudinally on thebase 1 andcarrying with it the motor 2 onwhich it is supported. lVith this construction, it will be readily seenthat a lateral or longitudinal adjustment of the motor 2 may be readilyelfected.

The motor 2 is provided with the customary the grinding wheel 12. Thelateral or longitudinal adjustment of the motor above described isrendered possible4 so that the position of the wheel ,2 may be regulatedas occasionA demands. The base 1 at the front of the motor extends to aplane higher than that part which supports4 the motor and terminates ina relatively long or oblong shaped support 13 for supporting the oblongshaped base 14 of the work holder. This base 14 is pivoted to the base13 as at 15 so that the base 14, while being held against longitudinalmovement is ca able of being swung around the pivot 15, Ilo control andalso limit the swinging movement of the base 14, the base 13 is recessedto provide relatively long slots 16 at opposite ends of the base.Suitable thumb screws 1'( are adapted to be passed through these slotswith shaft 11 on the end of which is keyedV a threaded engagement withthe chuck head 18 of the wor holder and the mounting or tail stock 19for tlie centering pin 20. 21 re resents the stemof an Ordinar puppet yavg having the usual disk shaped' head 22 with the customary beveledsurface shown at Inasmuch as it is this beveled surface desired to becleaned and ground, the valve stem 21 is sup-ported by the chuck 24 withthe disk shaped ead 22 centered by the bolt20 so that the valve stem 21may be rotated b the shaft on which the chuck 24 is mounte 25 representsan end abutment for the shaft. In order to present the beveled surface23 of the valve ead to the wheel 12 at the proper angle for grinding,the work holder or rather the mounting for the chuck which carries thevalve is presented to the wheel12 at an oblique angle, so that the bevelon the valve head will bepresented the axis of the wheel 12. means ofthe thumb screws justed. Consequently,

` le \r 26 is keyed to a collar connecting the pulleys pivotal mountingof the base 14, any variation of this adjustment may be acoomplished.Furthermore with the manner of ii-iountin the motor 2, the relativeposition of the w leel l2 and the disk shaped head of the 'valve may bechan ed. To rotate the valve in the work holer, a drive is imparted fromthe shaft. 11.of the motor. It is established by a belt. from the shaft11 to the pulley 26 which is supported by the arm 2T and the bearings2S. The arm 2'( being fixed to the block 4 and inasmuch as the pulley 26is supported on the arm, the distance between it and the shaft will bechanged when the motor 2f 'is laterally `adthe belt from the, should beof rubber material. The pul- 2!) made to receive one end of a flexibledriving shaftl() the other end of the shaft being received in asimilarcollar 31 which is fixed to the pulley 32 which in turn issupported b v means of the arm 33 working in suitable bearings as :itV34. The pulley 32 is'prescntedparallel with a pulley 35 mounted upon andkeyed to shaft 25. With a belt connecting the pulleys 32 -and 35, itwill renditv be seen how the necessaryrotation may heimpa-rted to thevalve stem 2l through the shaft.l 25 which isin driving relation withthe belt 32 and through the flexible drive shaft 30 and the beltingconnecting the shaft 11 and the pulley 26.

In supporting the valve in the work holder the end of the stein is ofcourse received .by the chuck 24 and the center pin 2O is turned uponuntil a tension is felt on the spring 36, which is confined between theend of the shaft.i 25 and the housing 37. The subbase 3 of the motor 2is'theu moved until the. wheel 12 is in close proximity to the beveledsurface 23 of the valve. Then shaft l1 to the roller 2G or some otherresilient,

the center pin 2O is again moved up to ilnpart a thrust or movement ofthe valve against the influence of the spring 36 until the beveledsurface 23 bears against the wheel l?. T he adjustments all made andmovable parts are locked together and the' motor started whereupon thegrinding action will start. By means of the handle 10 and the screw Sthe wheel may be moved across the beveled surface of the valve headshould occasion demand.

I claim: -r

1. A grinding machine having in combi for driving thesaid wheel havingashaft on which the wheel is mounted, fa. base for supporting sind motorhavin y effect-lng a lateral Vor longitu mal adjustnient of the motorwith the grinding w eel carried thereby, a work holder the grindingwheel is mounted, a..

.means for "r supportln the vulve with the beveledisurface ythereopresented parallel to the axis of the gl'inding wheel, means forchanging. the angleof "4' inclination of the valve relative' to thegrinding wheel, and means for effecting a rontact'with the beveledsurface of the'valve head with the wheel un with means for adjustingsaid tension.

In a machine of the class described, a

der spring tension motor having a driving shaft, a grinding.-

wheel on said shaft and adapted to be driven thereb cluding a main basemovable in a horizontal plane parallel to the driving shaft of the'motor. a sub-base upon which the motor is directly supported, saidsub-base mounted upon the main base and movable thereon in a horizontalplane transverse to the driving shaft of the motor; and a work holder,for supporting the work in contact with the grinding wheel and at anangle to the axis of rotation thereof, and means i )r changing thehorizontal angular position of the work holder.

l. A machine of the as set forth in claim 3 work is adapt-ed to besupported on the work holder in grinding contact with the grinding wheelunder spring tension with means for changing the effective tension ofsaid spring tension means.

JOHN O. ROLLINS.

, a'support. for the motor in-- being

